CN115615138A - Hydrogen liquefaction system for circulating expansion refrigeration of nitrogen and neon - Google Patents

Hydrogen liquefaction system for circulating expansion refrigeration of nitrogen and neon Download PDF

Info

Publication number
CN115615138A
CN115615138A CN202211332565.0A CN202211332565A CN115615138A CN 115615138 A CN115615138 A CN 115615138A CN 202211332565 A CN202211332565 A CN 202211332565A CN 115615138 A CN115615138 A CN 115615138A
Authority
CN
China
Prior art keywords
passage
inlet
pipeline
outlet
hydrogen
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202211332565.0A
Other languages
Chinese (zh)
Inventor
刘庆洋
沈海涛
徐广磊
魏凯
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Jiangsu Guofu Hydrogen Energy Technology Equipment Co Ltd
Zhangjiagang Hydrogen Cloud New Energy Research Institute Co Ltd
Original Assignee
Jiangsu Guofu Hydrogen Energy Technology Equipment Co Ltd
Zhangjiagang Hydrogen Cloud New Energy Research Institute Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Jiangsu Guofu Hydrogen Energy Technology Equipment Co Ltd, Zhangjiagang Hydrogen Cloud New Energy Research Institute Co Ltd filed Critical Jiangsu Guofu Hydrogen Energy Technology Equipment Co Ltd
Priority to CN202211332565.0A priority Critical patent/CN115615138A/en
Publication of CN115615138A publication Critical patent/CN115615138A/en
Pending legal-status Critical Current

Links

Images

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J1/00—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures
    • F25J1/0002—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures characterised by the fluid to be liquefied
    • F25J1/0005—Light or noble gases
    • F25J1/001—Hydrogen
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J1/00—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures
    • F25J1/003—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures characterised by the kind of cold generation within the liquefaction unit for compensating heat leaks and liquid production
    • F25J1/0032—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures characterised by the kind of cold generation within the liquefaction unit for compensating heat leaks and liquid production using the feed stream itself or separated fractions from it, i.e. "internal refrigeration"
    • F25J1/0035—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures characterised by the kind of cold generation within the liquefaction unit for compensating heat leaks and liquid production using the feed stream itself or separated fractions from it, i.e. "internal refrigeration" by gas expansion with extraction of work
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J1/00—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures
    • F25J1/003—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures characterised by the kind of cold generation within the liquefaction unit for compensating heat leaks and liquid production
    • F25J1/0032—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures characterised by the kind of cold generation within the liquefaction unit for compensating heat leaks and liquid production using the feed stream itself or separated fractions from it, i.e. "internal refrigeration"
    • F25J1/0045—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures characterised by the kind of cold generation within the liquefaction unit for compensating heat leaks and liquid production using the feed stream itself or separated fractions from it, i.e. "internal refrigeration" by vaporising a liquid return stream
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J1/00—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures
    • F25J1/003—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures characterised by the kind of cold generation within the liquefaction unit for compensating heat leaks and liquid production
    • F25J1/0047—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures characterised by the kind of cold generation within the liquefaction unit for compensating heat leaks and liquid production using an "external" refrigerant stream in a closed vapor compression cycle
    • F25J1/005—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures characterised by the kind of cold generation within the liquefaction unit for compensating heat leaks and liquid production using an "external" refrigerant stream in a closed vapor compression cycle by expansion of a gaseous refrigerant stream with extraction of work
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J1/00—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures
    • F25J1/006—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures characterised by the refrigerant fluid used
    • F25J1/0062—Light or noble gases, mixtures thereof
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J1/00—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures
    • F25J1/006—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures characterised by the refrigerant fluid used
    • F25J1/007—Primary atmospheric gases, mixtures thereof
    • F25J1/0072—Nitrogen
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J1/00—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures
    • F25J1/006—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures characterised by the refrigerant fluid used
    • F25J1/0097—Others, e.g. F-, Cl-, HF-, HClF-, HCl-hydrocarbons etc. or mixtures thereof
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J1/00—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures
    • F25J1/02—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures requiring the use of refrigeration, e.g. of helium or hydrogen ; Details and kind of the refrigeration system used; Integration with other units or processes; Controlling aspects of the process
    • F25J1/0203—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures requiring the use of refrigeration, e.g. of helium or hydrogen ; Details and kind of the refrigeration system used; Integration with other units or processes; Controlling aspects of the process using a single-component refrigerant [SCR] fluid in a closed vapor compression cycle
    • F25J1/0208—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures requiring the use of refrigeration, e.g. of helium or hydrogen ; Details and kind of the refrigeration system used; Integration with other units or processes; Controlling aspects of the process using a single-component refrigerant [SCR] fluid in a closed vapor compression cycle in combination with an internal quasi-closed refrigeration loop, e.g. with deep flash recycle loop
    • F25J1/0209—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures requiring the use of refrigeration, e.g. of helium or hydrogen ; Details and kind of the refrigeration system used; Integration with other units or processes; Controlling aspects of the process using a single-component refrigerant [SCR] fluid in a closed vapor compression cycle in combination with an internal quasi-closed refrigeration loop, e.g. with deep flash recycle loop as at least a three level refrigeration cascade
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J1/00—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures
    • F25J1/02—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures requiring the use of refrigeration, e.g. of helium or hydrogen ; Details and kind of the refrigeration system used; Integration with other units or processes; Controlling aspects of the process
    • F25J1/0211—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures requiring the use of refrigeration, e.g. of helium or hydrogen ; Details and kind of the refrigeration system used; Integration with other units or processes; Controlling aspects of the process using a multi-component refrigerant [MCR] fluid in a closed vapor compression cycle
    • F25J1/0214—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures requiring the use of refrigeration, e.g. of helium or hydrogen ; Details and kind of the refrigeration system used; Integration with other units or processes; Controlling aspects of the process using a multi-component refrigerant [MCR] fluid in a closed vapor compression cycle as a dual level refrigeration cascade with at least one MCR cycle
    • F25J1/0215—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures requiring the use of refrigeration, e.g. of helium or hydrogen ; Details and kind of the refrigeration system used; Integration with other units or processes; Controlling aspects of the process using a multi-component refrigerant [MCR] fluid in a closed vapor compression cycle as a dual level refrigeration cascade with at least one MCR cycle with one SCR cycle
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J1/00—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures
    • F25J1/02—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures requiring the use of refrigeration, e.g. of helium or hydrogen ; Details and kind of the refrigeration system used; Integration with other units or processes; Controlling aspects of the process
    • F25J1/0243—Start-up or control of the process; Details of the apparatus used; Details of the refrigerant compression system used
    • F25J1/0279—Compression of refrigerant or internal recycle fluid, e.g. kind of compressor, accumulator, suction drum etc.
    • F25J1/0285—Combination of different types of drivers mechanically coupled to the same refrigerant compressor, possibly split on multiple compressor casings
    • F25J1/0288—Combination of different types of drivers mechanically coupled to the same refrigerant compressor, possibly split on multiple compressor casings using work extraction by mechanical coupling of compression and expansion of the refrigerant, so-called companders
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J2240/00—Processes or apparatus involving steps for expanding of process streams
    • F25J2240/60—Expansion by ejector or injector, e.g. "Gasstrahlpumpe", "venturi mixing", "jet pumps"
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J2245/00—Processes or apparatus involving steps for recycling of process streams
    • F25J2245/90—Processes or apparatus involving steps for recycling of process streams the recycled stream being boil-off gas from storage
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J2270/00—Refrigeration techniques used
    • F25J2270/14—External refrigeration with work-producing gas expansion loop
    • F25J2270/16—External refrigeration with work-producing gas expansion loop with mutliple gas expansion loops of the same refrigerant

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • Thermal Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Separation By Low-Temperature Treatments (AREA)

Abstract

The invention discloses a hydrogen liquefying system for circulating expansion refrigeration of nitrogen and neon, which comprises: the system comprises a first heat exchanger, a second heat exchanger, a third heat exchanger, a fourth heat exchanger, a fifth heat exchanger, a subcooler, a first nitrogen turboexpander, a second nitrogen turboexpander, a first neon turboexpander, a second neon turboexpander, a hydrogen low-temperature purifier, an ejector and a liquid hydrogen storage tank. The capacity of the hydrogen liquefaction system can be greatly improved to 30 tons/day, the capacity is 3 times of that of the prior art, and the large-scale application of hydrogen can be more effectively promoted. The comprehensive energy consumption of the existing 10-ton/day hydrogen liquefaction system is 13 to 13.5KWh/kg of liquid hydrogen, while the comprehensive energy consumption of the 30-ton/day hydrogen liquefaction system is 10KWh/kg of liquid hydrogen, so that the unit energy consumption is lower, and the cost is lower.

Description

Hydrogen liquefaction system for circulating expansion refrigeration of nitrogen and neon
Technical Field
The invention relates to the field of energy production equipment, in particular to a high-efficiency energy-saving hydrogen liquefaction system.
Background
The largest domestic autonomous hydrogen liquefaction technology in the current market is a 10 ton/day hydrogen liquefaction technology, the liquefaction technology adopts hydrogen circulation expansion refrigeration to obtain cold energy required by liquefied hydrogen, hydrogen needs to be compressed in the hydrogen circulation expansion refrigeration, but the cost and the energy consumption of a compressor are large due to the fact that the hydrogen is not easily compressed, and the demand of the larger-scale hydrogen liquefaction technology is high along with the further development of the hydrogen energy market. The maximum scale of the existing domestic autonomous hydrogen liquefaction process technology is 10 tons/day, and the technology cannot adapt to large-scale hydrogen energy development in the future, so that a hydrogen liquefaction system with higher productivity and lower energy consumption is urgently needed.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: the hydrogen liquefying system for the nitrogen and the neon circulating expansion refrigeration has higher productivity and lower energy consumption.
In order to solve the problems, the technical scheme adopted by the invention is as follows: a hydrogen liquefaction system of nitrogen and neon circulation expansion refrigeration, its characterized in that: the method comprises the following steps: the first heat exchanger is provided with an A1 channel, an A2 channel, an A3 channel, an A4 channel, an A5 channel and an A6 channel, the second heat exchanger is provided with a B1 channel, a B2 channel, a B3 channel, a B5 channel and a B6 channel, the third heat exchanger is provided with a C1 channel, a C2 channel, a C3 channel, a C4 channel, a C5 channel and a C6 channel, the fourth heat exchanger is provided with a D1 channel, a D2 channel, a D3 channel and a D4 channel, the fifth heat exchanger is provided with an E1 channel, an E2 channel, an E3 channel and an E4 channel, an F1 passage, an F2 passage, a C2 passage, an F1 passage, an ortho-para hydrogen conversion catalyst is filled in the F1 passage, one end of a hydrogen pipeline is connected with an inlet of the A1 passage, an outlet of the A1 passage is connected with an inlet of the B1 passage through a pipeline, an outlet of the B1 passage is connected with an inlet of the C1 passage through a pipeline, an outlet of the C1 passage is connected with an inlet of a hydrogen low-temperature purifier through a pipeline, an outlet of the hydrogen low-temperature purifier is connected with an inlet of the C2 passage through a pipeline, an outlet of the C2 passage is connected with an inlet of the D1 passage through a pipeline, an outlet of the D1 passage is connected with an expansion inlet of a hydrogen turboexpander through a pipeline, an expansion outlet of the hydrogen turboexpander is connected with an inlet of the E1 passage through a pipeline, an outlet of the E1 passage is connected with an inlet of an ejector through a pipeline, an outlet of the ejector is connected with an inlet of the F1 passage through a pipeline, and an outlet of the F1 passage is connected with a liquid hydrogen storage tank through a first pipeline, the first pipeline is connected in series with a first throttle valve, the outlet of the F1 passage is also connected with the inlet of the F2 passage through a second pipeline, the second pipeline is connected in series with a second throttle valve, the outlet of the F2 passage is connected with the inlet of the E2 passage through a pipeline, the outlet of the E2 passage is connected with the inlet of the D2 passage through a pipeline, the outlet of the D2 passage is connected with the inlet of the C3 passage through a pipeline, the outlet of the C3 passage is connected with the inlet of the B2 passage through a pipeline, the outlet of the B2 passage is connected with the inlet of the A2 passage through a pipeline, the outlet of the A2 passage is connected with the inlet of the first centrifugal compressor through a pipeline, the outlet of the first centrifugal compressor is connected with the inlet of the first circulating water cooler through a pipeline, the outlet of the first circulating water cooler is connected with the hydrogen pipeline through a pipeline, the expansion outlet of the first nitrogen turbine expander is connected with the inlet of the B3 passage through a pipeline, the outlet of the B3 passage is connected with the inlet of the A3 passage through a pipeline, the outlet of the A3 passage is connected with the inlet of the second centrifugal compressor through a pipeline, the outlet of the second centrifugal compressor is connected with the inlet of the second circulating water cooler through a pipeline, the outlet of the second circulating water cooler is connected with the boosting brake inlet of the second nitrogen turboexpander through a pipeline, the expansion outlet of the second nitrogen turboexpander is connected with the inlet of the C4 passage through a pipeline, the outlet of the C4 passage is connected with the inlet of the B3 passage through a pipeline, the boosting brake outlet of the second nitrogen turboexpander is connected with the inlet of the third circulating water cooler through a pipeline, the outlet of the third circulating water cooler is connected with the boosting brake inlet of the first nitrogen turboexpander through a pipeline, the boosting brake outlet of the first nitrogen turboexpander is connected with the inlet of the fourth circulating water cooler through a pipeline, the outlet of the fourth circulating water cooler is connected with the inlet of the A4 passage through a pipeline, the outlet of the A4 passage is respectively connected with the expansion inlet of the first nitrogen turboexpander and the inlet of the B4 passage through pipelines, the outlet of the B4 passage is connected with the expansion inlet of the second nitrogen turboexpander through a pipeline, the expansion outlet of the first neon turboexpander is connected with the inlet of the D3 passage through a pipeline, the outlet of the D3 passage is connected with the inlet of the C5 passage through a pipeline, the outlet of the C5 passage is connected with the inlet of the B5 passage through a pipeline, the outlet of the B5 passage is connected with the inlet of the A5 passage through a pipeline, the outlet of the A5 passage is connected with the inlet of the third centrifugal compressor through a pipeline, the outlet of the third centrifugal compressor is connected with the inlet of the fifth circulating water cooler through a pipeline, the outlet of the fifth circulating water cooler is connected with the pressurization brake inlet of the first neon turboexpander through a pipeline, the boosting brake outlet of the first neon turboexpander is connected with the inlet of a sixth circulating water cooler through a pipeline, the outlet of the sixth circulating water cooler is connected with the boosting brake inlet of the second neon turboexpander through a pipeline, the expansion outlet of the second neon turboexpander is connected with the inlet of an E3 passage through a pipeline, the outlet of the E3 passage is connected with the inlet of a D3 passage through a pipeline, the boosting brake outlet of the second neon turboexpander is connected with the inlet of an A6 passage through a pipeline, the outlet of the A6 passage is connected with the inlet of a B6 passage through a pipeline, the outlet of the B6 passage is connected with the inlet of a C6 passage through a pipeline, the outlet of the C6 passage is connected with the inlet of a D4 passage through a pipeline, the outlet of the D4 passage is respectively connected with the inlet of the E4 passage and the expansion inlet of the first neon turboexpander through pipelines, the outlet of the E4 passage is connected with the expansion inlet of the second neon turboexpander through a pipeline, and a BOG outlet on the liquid hydrogen storage tank is connected with a throat inlet of the ejector through a pipeline.
Further, the hydrogen liquefying system for nitrogen and neon circulating expansion refrigeration comprises: the hydrogen turbo expander adopts an air bearing to support a main shaft in the expander, and the air bearing adopts hydrogen as working gas.
Further, the hydrogen liquefying system for nitrogen and neon cyclic expansion refrigeration comprises: the D1 path and the E1 path are also filled with an ortho-para hydrogen conversion catalyst.
Further, the hydrogen liquefying system for nitrogen and neon circulating expansion refrigeration comprises: the first heat exchanger, the second heat exchanger, the third heat exchanger, the turbine expansion part of the first nitrogen turbine expander, the turbine expansion part of the second nitrogen turbine expander and the hydrogen low-temperature purifier are all positioned in a pre-cooling cold box, and the pre-cooling cold box is insulated and cold-preserved by pearlite sand; and the fourth heat exchanger, the fifth heat exchanger, the subcooler, the turbo expansion part of the first neon turbo expander, the turbo expansion part of the second neon turbo expander and the turbo expansion part of the hydrogen turbo expander are all positioned in the liquefaction cold box, and the liquefaction cold box is cooled through dynamic vacuum.
Further, the hydrogen liquefying system for nitrogen and neon circulating expansion refrigeration comprises: a third throttle valve is connected in series to a pipeline between the outlet of the A4 passage and the expansion inlet of the first nitrogen turbine expander, and a fourth throttle valve is connected in series to a pipeline between the BOG outlet of the liquid hydrogen storage tank and the throat inlet of the ejector.
The invention has the advantages that: the hydrogen liquefaction system has the advantages that the nitrogen circulating expansion refrigeration is adopted to carry out three-stage precooling on the raw material hydrogen, the neon circulating expansion refrigeration with stronger refrigeration capacity and lower energy consumption is adopted to carry out two-stage cooling on the raw material hydrogen, the hydrogen turbo expander is adopted to make the raw material hydrogen do work and cool in a heat-insulating expansion mode, and the low-temperature reflux hydrogen is adopted to cool the raw material hydrogen, so that the capacity of the hydrogen liquefaction system can be greatly improved to 30 tons/day, the capacity is 3 times that of the prior art, and the large-scale application of the hydrogen can be more effectively promoted. The comprehensive energy consumption of the existing 10-ton/day hydrogen liquefaction system is 13 to 13.5KWh/kg of liquid hydrogen, while the comprehensive energy consumption of the 30-ton/day hydrogen liquefaction system is 10KWh/kg of liquid hydrogen, so that the unit energy consumption is lower, and the cost is lower.
Drawings
Fig. 1 is a schematic structural diagram of a hydrogen liquefaction system for nitrogen and neon cyclic expansion refrigeration according to the present invention.
Detailed Description
The present invention will be described in further detail below with reference to specific embodiments and the accompanying drawings.
As shown in fig. 1, a hydrogen liquefying system for refrigerating by circularly expanding nitrogen and neon comprises: a first heat exchanger 1, a second heat exchanger 2, a third heat exchanger 3, a fourth heat exchanger 4, a fifth heat exchanger 5, a subcooler 6, a first nitrogen turbo expander 7, a second nitrogen turbo expander 8, a first neon turbo expander 9, a second neon turbo expander 10, a hydrogen turbo expander 71, a hydrogen low-temperature purifier 72, an ejector 73, and a liquid hydrogen storage tank 74, wherein the first heat exchanger 1 is provided with an A1 passage 11, an A2 passage 12, an A3 passage 13, an A4 passage 14, an A5 passage 15, and an A6 passage 16, the second heat exchanger 2 is provided with a B1 passage 21, a B2 passage 22, a B3 passage 23, a B4 passage 24, a B5 passage 25, and a B6 passage 26, the third heat exchanger 3 is provided with a C1 passage 31, a C2 passage 32, a C3 passage 33, a C4 passage 34, a C5 passage 35, and a C6 passage 36, the fourth heat exchanger 4 is provided with a D1 passage 41, a D2 passage 42, a D3 passage 43, and a D4 passage 44, the fifth heat exchanger 5 is provided with an E1 passage 51, an E2 passage 52, an E3 passage 53 and an E4 passage 54, the subcooler 6 is provided with an F1 passage 61 and an F2 passage 62, the C2 passage 32 and the F1 passage 61 are filled with an n-para hydrogen conversion catalyst, one end of a hydrogen pipeline 88 is connected with an inlet of the A1 passage 11, an outlet of the A1 passage 11 is connected with an inlet of the B1 passage 21 through a pipeline, an outlet of the B1 passage 21 is connected with an inlet of the C1 passage 31 through a pipeline, an outlet of the C1 passage 31 is connected with an inlet of a hydrogen low-temperature purifier 72 through a pipeline, an outlet of the hydrogen low-temperature purifier 72 is connected with an inlet of the C2 passage 32 through a pipeline, an outlet of the C2 passage 32 is connected with an inlet of the D1 passage 41 through a pipeline, an outlet of the D1 passage 41 is connected with an expansion inlet of a hydrogen turbo expander 71 through a pipeline, an expansion outlet of the hydrogen turbo expander 71 is connected with an inlet of the E1 passage 51 through a pipeline, the outlet of the E1 passage 51 is connected with the inlet of the ejector 73 through a pipeline, the outlet of the ejector 73 is connected with the inlet of the F1 passage 61 through a pipeline, the outlet of the F1 passage 61 is connected with the liquid hydrogen storage tank 74 through a first pipeline 91, the first pipeline 91 is connected with a first throttle valve 75 in series, the outlet of the F1 passage 61 is also connected with the inlet of the F2 passage 62 through a second pipeline 92, the second pipeline 92 is connected with a second throttle valve 76 in series, the outlet of the F2 passage 62 is connected with the inlet of the E2 passage 52 through a pipeline, the outlet of the E2 passage 52 is connected with the inlet of the D2 passage 42 through a pipeline, the outlet of the D2 passage 42 is connected with the inlet of the C3 passage 33 through a pipeline, the outlet of the C3 passage 33 is connected with the inlet of the B2 passage 22 through a pipeline, the outlet of the B2 passage 22 is connected with the inlet of the A2 passage 12 through a pipeline, the outlet of the A2 passage 12 is connected with the inlet of the first centrifugal compressor 77 through a pipeline, the outlet of the first centrifugal compressor 77 is connected to the inlet of a first circulating water cooler 78 through a pipe, the outlet of the first circulating water cooler 78 is connected to a hydrogen pipe 88 through a pipe, the expansion outlet of the first nitrogen turbo expander 7 is connected to the inlet of the B3 path 23 through a pipe, the outlet of the B3 path 23 is connected to the inlet of the A3 path 13 through a pipe, the outlet of the A3 path 13 is connected to the inlet of the second centrifugal compressor 81 through a pipe, the outlet of the second centrifugal compressor 81 is connected to the inlet of the second circulating water cooler 82 through a pipe, the outlet of the second circulating water cooler 82 is connected to the booster brake inlet of the second nitrogen turbo expander 8 through a pipe, the expansion outlet of the second nitrogen turbo expander 8 is connected to the inlet of the C4 path 34 through a pipe, the outlet of the C4 path 34 is connected to the inlet of the B3 path 23 through a pipe, the booster brake outlet of the second nitrogen turboexpander 8 is connected to the inlet of a third circulating water cooler 79 through a pipe, the outlet of the third circulating water cooler 79 is connected to the booster brake inlet of the first nitrogen turboexpander 7 through a pipe, the booster brake outlet of the first nitrogen turboexpander 7 is connected to the inlet of a fourth circulating water cooler 80 through a pipe, the outlet of the fourth circulating water cooler 80 is connected to the inlet of the A4 passage 14 through a pipe, the outlet of the A4 passage 14 is connected to the expansion inlet of the first nitrogen turboexpander 7 and the inlet of the B4 passage 24 through pipes, the outlet of the B4 passage 24 is connected to the expansion inlet of the second nitrogen turboexpander 8 through a pipe, the expansion outlet of the first neon turboexpander 9 is connected to the inlet of the D3 passage 43 through a pipe, the outlet of the D3 passage 43 is connected to the inlet of the C5 passage 35 through a pipe, the outlet of the C5 passage 35 is connected to the inlet of the B5 passage 25 through a pipe, the outlet of the B5 passage 25 is connected to the inlet of the A5 passage 15 through a pipe, the outlet of the A5 passage 15 is connected to the inlet of the third turbo expander through a centrifugal water cooler 9, the inlet of the centrifugal compressor 3, the centrifugal compressor 3 compressor is connected to the inlet of the neon turbo expander 3, the centrifugal compressor 83, the centrifugal compressor 3 compressor is connected to the inlet of the second neon turbo expander 9, the booster brake outlet of the second neon turboexpander 10 is connected with the inlet of the A6 passage 16 through a pipeline, the outlet of the A6 passage 16 is connected with the inlet of the B6 passage 26 through a pipeline, the outlet of the B6 passage 26 is connected with the inlet of the C6 passage 36 through a pipeline, the outlet of the C6 passage 36 is connected with the inlet of the D4 passage 44 through a pipeline, the outlet of the D4 passage 44 is respectively connected with the inlet of the E4 passage 54 and the expansion inlet of the first neon turboexpander 9 through pipelines, the outlet of the E4 passage 54 is connected with the expansion inlet of the second neon turboexpander 10 through a pipeline, and the BOG outlet on the liquid hydrogen storage tank 74 is connected with the throat inlet of the ejector 73 through a pipeline.
In the present embodiment, the D1 path 41 and the E1 path 51 are also filled with an ortho-para hydrogen conversion catalyst, so that the ortho-para hydrogen conversion can be performed even when the raw material hydrogen passes through the D1 path 41 and the E1 path 51. The first heat exchanger 1, the second heat exchanger 2, the third heat exchanger 3, the turbine expansion part of the first nitrogen turbine expander 7, the turbine expansion part of the second nitrogen turbine expander 8 and the hydrogen low-temperature purifier 72 are all positioned in a pre-cooling cold box 89, and the pre-cooling cold box 89 is insulated and cooled by pearlite; the fourth heat exchanger 4, the fifth heat exchanger 5, the subcooler 6, the turbo-expansion part of the first neon turbo-expander 9, the turbo-expansion part of the second neon turbo-expander 10 and the turbo-expansion part of the hydrogen turbo-expander 71 are all located in the liquefied cold box 90, and the liquefied cold box 90 is cooled through dynamic vacuum.
A third throttle valve 87 is connected in series to the pipe between the outlet of the A4 path 14 and the expansion inlet of the first nitrogen turbo-expander 7, and a fourth throttle valve 86 is connected in series to the pipe between the BOG outlet of the liquid hydrogen tank 74 and the throat inlet of the ejector 73.
The hydrogen turbo expander 71 adopts an air bearing to support a main shaft in the expander, the air bearing adopts hydrogen as working gas, the hydrogen turbo expander 71 cannot adopt an oil bearing to support the main shaft, and oil in the oil bearing easily pollutes raw material hydrogen.
During operation, raw material hydrogen to be liquefied is prepared by electrolytic hydrogen production, the purity of the raw material hydrogen is more than 99.999 percent, the pressure is 1.6Mpa (A), the temperature is less than or equal to 40 ℃, the raw material hydrogen enters an A1 passage 11 in a first heat exchanger 1 through a hydrogen pipeline 88 for heat exchange and precooling, the raw material hydrogen is cooled to 290K, then the raw material hydrogen enters a B1 passage 21 in a second heat exchanger 2 for heat exchange and precooling, the raw material hydrogen is cooled to 83K, then the raw material hydrogen enters a hydrogen low-temperature purifier 72 for impurity removal, then the raw material hydrogen enters a C2 passage 32 for normal-secondary hydrogen conversion, the concentration of secondary hydrogen in the raw material hydrogen reaches 47 percent, then the raw material hydrogen enters a D1 passage 41 in a fourth heat exchanger 4 for heat exchange and cooling, the raw material hydrogen is cooled to 60K, then raw material hydrogen enters a hydrogen turbo expander 71 to be expanded in a turbine mode, the raw material hydrogen is expanded to 13Bara, the isentropic efficiency is more than or equal to 75%, the temperature of the raw material hydrogen is reduced to below 56.6K, then the raw material hydrogen enters an E1 passage 51 in a fifth heat exchanger 5 to be subjected to heat exchange and cooling, the raw material hydrogen is cooled to 32K, the raw material hydrogen is converted into saturated liquid hydrogen at the moment, the saturated liquid hydrogen is easy to vaporize, then the raw material hydrogen enters an ejector 73 to be throttled and expanded, the raw material hydrogen is cooled to 23.5K, then the raw material hydrogen enters an F1 passage 61 in a subcooler 6 to be subjected to heat exchange and cooling, the raw material hydrogen is cooled to 23K, meanwhile, normal-para-hydrogen conversion is carried out in the F1 passage 61 to enable the para-hydrogen concentration in the raw material hydrogen to reach above 97%, then a part of the hydrogen in the raw material hydrogen is throttled and expanded to be cooled to about 20.9K through a first throttling valve 75 and then enters a liquid hydrogen storage tank 74 to be stored;
the remaining part of the raw material hydrogen is used as reflux hydrogen, is throttled, expanded and cooled to about 20.9K by a second throttling valve 76, enters an F2 passage 62 in a subcooler 6 to serve as a refrigerant to provide cold energy for heat exchange, then the reflux hydrogen enters an E2 passage 52 in a fifth heat exchanger 5 to serve as the refrigerant to provide cold energy for heat exchange, then the reflux hydrogen enters a D2 passage 42 in a fourth heat exchanger 4 to serve as the refrigerant to provide cold energy for heat exchange, then the reflux hydrogen enters a C3 passage 33 in a third heat exchanger 3 to serve as the refrigerant to provide cold energy for heat exchange, then the reflux hydrogen enters a B2 passage 22 in the second heat exchanger 2 to serve as the refrigerant to provide cold energy for heat exchange, then the reflux hydrogen enters an A2 passage 12 in a first heat exchanger 1 to serve as the refrigerant to provide cold energy for heat exchange, at the moment, the reflux hydrogen is reheated to about 310K, and then the reflux hydrogen sequentially enters a first centrifugal compressor 77 and a first circulating water cooler 78, so that the reflux hydrogen is pressurized to 16Bara, the temperature of which is controlled at about 313K, and then the reflux hydrogen flows into a hydrogen reflux pipeline 88 to be mixed with the raw material hydrogen;
the low-temperature nitrogen with the temperature of 80K after adiabatic expansion and temperature reduction in the second nitrogen turboexpander 8 enters a C4 passage 34 in a third heat exchanger 3 to be used as a refrigerant for providing cold energy for heat exchange, then the part of the low-temperature nitrogen and the low-temperature nitrogen with the temperature of 142K after adiabatic expansion and temperature reduction in the first nitrogen turboexpander 7 are merged into a B3 passage 23 in the second heat exchanger 2 to be used as the refrigerant for providing cold energy for heat exchange, then the low-temperature nitrogen enters an A3 passage 13 in the first heat exchanger 1 to be used as the refrigerant for providing the cold energy for heat exchange, then the nitrogen with the temperature recovery sequentially enters a second centrifugal compressor 81 and a second circulating water cooler 82, so that the nitrogen can be pressurized and cooled, then the nitrogen enters a pressurizing brake part of the second nitrogen turboexpander 8 for braking and pressurizing, then the pressurized nitrogen enters a third circulating water cooler 79 for cooling, then the nitrogen enters a pressurizing brake part of the first nitrogen turboexpander 7 for braking and pressurizing, then the pressurized nitrogen enters a fourth circulating nitrogen turboexpander 80 for cooling, then the nitrogen water enters an A4 passage 14 in the first nitrogen turboexpander 8, then enters another third heat exchanger 2 for cooling after adiabatic expansion and temperature reduction, and temperature reduction in the second nitrogen precooling heat exchanger 2, and temperature reduction in the second nitrogen expansion and temperature reduction in the second nitrogen precooling heat exchanger 2;
the low-temperature neon with the temperature of 28K after adiabatic expansion and temperature reduction in the second neon turbo expander 10 enters an E3 passage 53 in the fifth heat exchanger 5 to be used as a refrigerant to provide cold energy for heat exchange, then the part of low-temperature neon and the low-temperature neon with the temperature of 37K after adiabatic expansion and temperature reduction in the first neon turbo expander 9 are merged into a D3 passage 43 in the fourth heat exchanger 4 to be used as a refrigerant for providing cold energy for heat exchange, then the low-temperature neon enters a C5 channel 35 in the third heat exchanger 3 to be used as a refrigerant to provide cold energy for heat exchange, then the low-temperature neon enters a B5 passage 25 in the second heat exchanger 2 to be used as a refrigerant to provide cold energy for heat exchange, then the low-temperature neon enters an A5 passage 15 in the first heat exchanger 1 to be used as a refrigerant for providing cold energy for heat exchange, at the moment, the neon is reheated to 310K, the neon enters a third centrifugal compressor 83 and a fifth circulating water cooler 84 in sequence, so that the neon can be pressurized and cooled, then the neon enters a booster brake part of the first neon turbo expander 9 for braking and boosting, the neon enters a sixth circulating water cooler 85 for cooling, then enters a booster brake part of the second neon turboexpander 10 for braking and boosting to 30 Bara, then the neon enters an A6 passage 16 in the first heat exchanger 1 for heat exchange and precooling, then the neon enters a B6 passage 26 in the second heat exchanger 2 for heat exchange and precooling, then the neon enters a C6 channel 36 in the third heat exchanger 3 for heat exchange and precooling, then the neon enters a D4 channel 44 in the fourth heat exchanger 4 for heat exchange and precooling, then one part of the neon enters a first neon turbo-expander 9 for adiabatic expansion and temperature reduction, the other part of the neon enters an E4 passage 54 in a fifth heat exchanger 5 for heat exchange and precooling, then the part of neon enters a second neon turbo expander 10 for adiabatic expansion and temperature reduction;
BOG in the liquid hydrogen storage tank 74 enters the ejector 73 to be mixed with the raw material hydrogen after being throttled, expanded and cooled by the fourth throttle valve 86, and the BOG can be recovered after the arrangement.
The method adopts the nitrogen gas circulating expansion refrigeration to carry out three-stage precooling on the raw material hydrogen, adopts the neon gas circulating expansion refrigeration with stronger refrigeration capacity and lower energy consumption to carry out two-stage cooling on the raw material hydrogen, adopts the hydrogen turbine expander to make the raw material hydrogen perform adiabatic expansion work and cool, and adopts the low-temperature reflux hydrogen to cool the raw material hydrogen, so that the capacity of the hydrogen liquefying system can be greatly improved to 30 tons/day, the capacity is 3 times of that of the prior art, and the large-scale application of the hydrogen can be more effectively promoted.
The comprehensive energy consumption of the existing 10-ton/day hydrogen liquefaction system is 13 to 13.5KWh/kg of liquid hydrogen, while the comprehensive energy consumption of the 30-ton/day hydrogen liquefaction system is 10KWh/kg of liquid hydrogen, so that the unit energy consumption is lower, and the cost is lower.

Claims (5)

1. A hydrogen liquefaction system of nitrogen and neon circulation expansion refrigeration, its characterized in that: the method comprises the following steps: the first heat exchanger is provided with an A1 channel, an A2 channel, an A3 channel, an A4 channel, an A5 channel and an A6 channel, the second heat exchanger is provided with a B1 channel, a B2 channel, a B3 channel, a B5 channel and a B6 channel, the third heat exchanger is provided with a C1 channel, a C2 channel, a C3 channel, a C4 channel, a C5 channel and a C6 channel, the fourth heat exchanger is provided with a D1 channel, a D2 channel, a D3 channel and a D4 channel, the fifth heat exchanger is provided with an E1 channel, an E2 channel, an E3 channel and an E4 channel, an F1 passage, an F2 passage, a C2 passage, an F1 passage, an ortho-para hydrogen conversion catalyst is filled in the F1 passage, one end of a hydrogen pipeline is connected with an inlet of the A1 passage, an outlet of the A1 passage is connected with an inlet of the B1 passage through a pipeline, an outlet of the B1 passage is connected with an inlet of the C1 passage through a pipeline, an outlet of the C1 passage is connected with an inlet of a hydrogen low-temperature purifier through a pipeline, an outlet of the hydrogen low-temperature purifier is connected with an inlet of the C2 passage through a pipeline, an outlet of the C2 passage is connected with an inlet of the D1 passage through a pipeline, an outlet of the D1 passage is connected with an expansion inlet of a hydrogen turboexpander through a pipeline, an expansion outlet of the hydrogen turboexpander is connected with an inlet of the E1 passage through a pipeline, an outlet of the E1 passage is connected with an inlet of an ejector through a pipeline, an outlet of the ejector is connected with an inlet of the F1 passage through a pipeline, and an outlet of the F1 passage is connected with a liquid hydrogen storage tank through a first pipeline, the first pipeline is connected in series with a first throttle valve, the outlet of the F1 passage is also connected with the inlet of the F2 passage through a second pipeline, the second pipeline is connected in series with a second throttle valve, the outlet of the F2 passage is connected with the inlet of the E2 passage through a pipeline, the outlet of the E2 passage is connected with the inlet of the D2 passage through a pipeline, the outlet of the D2 passage is connected with the inlet of the C3 passage through a pipeline, the outlet of the C3 passage is connected with the inlet of the B2 passage through a pipeline, the outlet of the B2 passage is connected with the inlet of the A2 passage through a pipeline, the outlet of the A2 passage is connected with the inlet of the first centrifugal compressor through a pipeline, the outlet of the first centrifugal compressor is connected with the inlet of the first circulating water cooler through a pipeline, the outlet of the first circulating water cooler is connected with the hydrogen pipeline through a pipeline, the expansion outlet of the first nitrogen turbine expander is connected with the inlet of the B3 passage through a pipeline, the outlet of the B3 passage is connected with the inlet of the A3 passage through a pipeline, the outlet of the A3 passage is connected with the inlet of the second centrifugal compressor through a pipeline, the outlet of the second centrifugal compressor is connected with the inlet of the second circulating water cooler through a pipeline, the outlet of the second circulating water cooler is connected with the boosting brake inlet of the second nitrogen turboexpander through a pipeline, the expansion outlet of the second nitrogen turboexpander is connected with the inlet of the C4 passage through a pipeline, the outlet of the C4 passage is connected with the inlet of the B3 passage through a pipeline, the boosting brake outlet of the second nitrogen turboexpander is connected with the inlet of the third circulating water cooler through a pipeline, the outlet of the third circulating water cooler is connected with the boosting brake inlet of the first nitrogen turboexpander through a pipeline, the boosting brake outlet of the first nitrogen turboexpander is connected with the inlet of the fourth circulating water cooler through a pipeline, the outlet of the fourth circulating water cooler is connected with the inlet of the A4 passage through a pipeline, the outlet of the A4 passage is respectively connected with the expansion inlet of the first nitrogen turboexpander and the inlet of the B4 passage through pipelines, the outlet of the B4 passage is connected with the expansion inlet of the second nitrogen turboexpander through a pipeline, the expansion outlet of the first neon turboexpander is connected with the inlet of the D3 passage through a pipeline, the outlet of the D3 passage is connected with the inlet of the C5 passage through a pipeline, the outlet of the C5 passage is connected with the inlet of the B5 passage through a pipeline, the outlet of the B5 passage is connected with the inlet of the A5 passage through a pipeline, the outlet of the A5 passage is connected with the inlet of the third centrifugal compressor through a pipeline, the outlet of the third centrifugal compressor is connected with the inlet of the fifth circulating water cooler through a pipeline, the outlet of the fifth circulating water cooler is connected with the pressurization brake inlet of the first neon turboexpander through a pipeline, the boosting brake outlet of the first neon turboexpander is connected with the inlet of a sixth circulating water cooler through a pipeline, the outlet of the sixth circulating water cooler is connected with the boosting brake inlet of the second neon turboexpander through a pipeline, the expansion outlet of the second neon turboexpander is connected with the inlet of an E3 passage through a pipeline, the outlet of the E3 passage is connected with the inlet of a D3 passage through a pipeline, the boosting brake outlet of the second neon turboexpander is connected with the inlet of an A6 passage through a pipeline, the outlet of the A6 passage is connected with the inlet of a B6 passage through a pipeline, the outlet of the B6 passage is connected with the inlet of a C6 passage through a pipeline, the outlet of the C6 passage is connected with the inlet of a D4 passage through a pipeline, the outlet of the D4 passage is respectively connected with the inlet of the E4 passage and the expansion inlet of the first neon turboexpander through pipelines, the outlet of the E4 passage is connected with the expansion inlet of the second neon turboexpander through a pipeline, and a BOG outlet on the liquid hydrogen storage tank is connected with a throat inlet of the ejector through a pipeline.
2. The nitrogen and neon cyclical expansion refrigeration hydrogen liquefaction system of claim 1, wherein: the hydrogen turbo expander adopts an air bearing to support a main shaft in the expander, and the air bearing adopts hydrogen as working gas.
3. A nitrogen and neon cyclical expansion refrigeration hydrogen liquefaction system according to claim 1 or 2, wherein: the D1 path and the E1 path are also filled with an ortho-para hydrogen conversion catalyst.
4. A nitrogen and neon cyclical expansion refrigeration hydrogen liquefaction system according to claim 1 or 2, wherein: the first heat exchanger, the second heat exchanger, the third heat exchanger, the turbine expansion part of the first nitrogen turbine expander, the turbine expansion part of the second nitrogen turbine expander and the hydrogen low-temperature purifier are all positioned in a pre-cooling cold box, and the pre-cooling cold box is insulated and cold-preserved by pearlite sand; and the fourth heat exchanger, the fifth heat exchanger, the subcooler, the turbo expansion part of the first neon turbo expander, the turbo expansion part of the second neon turbo expander and the turbo expansion part of the hydrogen turbo expander are all positioned in the liquefaction cold box, and the liquefaction cold box is cooled through dynamic vacuum.
5. A nitrogen and neon cyclical expansion refrigeration hydrogen liquefaction system according to claim 1 or 2, wherein: a third throttle valve is connected in series to a pipeline between the outlet of the A4 passage and the expansion inlet of the first nitrogen turbine expander, and a fourth throttle valve is connected in series to a pipeline between the BOG outlet of the liquid hydrogen storage tank and the throat inlet of the ejector.
CN202211332565.0A 2022-10-28 2022-10-28 Hydrogen liquefaction system for circulating expansion refrigeration of nitrogen and neon Pending CN115615138A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202211332565.0A CN115615138A (en) 2022-10-28 2022-10-28 Hydrogen liquefaction system for circulating expansion refrigeration of nitrogen and neon

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202211332565.0A CN115615138A (en) 2022-10-28 2022-10-28 Hydrogen liquefaction system for circulating expansion refrigeration of nitrogen and neon

Publications (1)

Publication Number Publication Date
CN115615138A true CN115615138A (en) 2023-01-17

Family

ID=84876618

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202211332565.0A Pending CN115615138A (en) 2022-10-28 2022-10-28 Hydrogen liquefaction system for circulating expansion refrigeration of nitrogen and neon

Country Status (1)

Country Link
CN (1) CN115615138A (en)

Similar Documents

Publication Publication Date Title
US20230067883A1 (en) Mixed refrigerant hydrogen liquefaction device and method of using same
CN107014151B (en) Device and method for liquefying hydrogen
CN110701870B (en) Air separation device and method utilizing LNG cold energy
US7469556B2 (en) Natural gas liquefaction system
WO2017121042A1 (en) Method and apparatus for liquefying methane-rich gas through expansion refrigeration
US3203191A (en) Energy derived from expansion of liquefied gas
CN105444523A (en) Reliquefaction system and technique for compressing expanded liquified BOG through BOG
CN115451647B (en) Hydrogen liquefaction system integrated with liquefied air energy storage system
CN113503692A (en) Hydrogen liquefaction system
CN110186251B (en) Three-cycle natural gas liquefaction device and method suitable for ultra-large scale
CN216620451U (en) LNG reforming hydrogen production and LNG cold energy liquefied hydrogen integrated system
CN210220390U (en) Three-cycle natural gas liquefaction device suitable for ultra-large scale
CN105737516A (en) System and method for liquefying natural gas by mixed refrigerant precooling and nitrogen expansion
CN112229142A (en) Low-coupling multi-strand composite expansion air separation flow device and method
CN114777412B (en) Hydrogen liquefying plant with thermal siphon type hydrogen subcooler
CN114777418B (en) System for extracting helium from natural gas BOG by condensation method
CN217654183U (en) Natural gas crude helium extracting and LNG (liquefied Natural gas) co-production device adopting nitrogen expansion refrigeration
CN204785551U (en) BOG recovery unit that liquefies again
CN114518015B (en) Hydrogen liquefaction process adopting nitrogen turbine expansion precooling
CN213020534U (en) Helium recovery system
CN115615138A (en) Hydrogen liquefaction system for circulating expansion refrigeration of nitrogen and neon
CN110487023B (en) Method for producing liquid nitrogen by utilizing LNG cold energy
CN114659338B (en) Refrigeration system and method for separating heavy hydrocarbon and methane in natural gas BOG
CN110746259A (en) Method for recovering rich-gas ethane with flash separator
CN218764248U (en) Propane precooling double-nitrogen expansion refrigeration natural gas stripping crude helium and LNG co-production device

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination